feat(charts): update helm release loki to v6.12.0

[renovate[bot]]

This PR contains the following updates:

Package	Update	Change
loki (source)	minor	6.11.0 -> 6.12.0

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Release Notes

grafana/helm-charts (loki)

### [`v6.12.0`](https://redirect.github.com/grafana/helm-charts/releases/tag/promtail-6.12.0) Promtail is an agent which ships the contents of local logs to a Loki instance #### What's Changed - \[promtail] Add host aliases by [@​YuleZ](https://redirect.github.com/YuleZ) in [https://github.com/grafana/helm-charts/pull/2546](https://redirect.github.com/grafana/helm-charts/pull/2546) **Full Changelog**: https://github.com/grafana/helm-charts/compare/grafana-agent-operator-0.3.0...promtail-6.12.0

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